Excavator.



J. L. FAIRBANKS- EXGAVATOR.

APPLICATION FILED AUG. 24, 1911. 1,078,842, Patented N0v.18,1913.

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rpm- Inventor Attorneys J. L. FAIRBANKS.

EXGAVATOR.. APPLICATION FILED AUG. 2 1911.

1,078,842, Patented Nov. 18, 1913.

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All" [H Ill '57 a l 5% Z Z6 IHIUIIHIIIIILLHHHHI lm len tpr Attorneys 'J.L. FAIRBANKS; EXGAVAT'OR.

. APPLIOATION FILED AUG. 24, 1911. I 1 0338 842. Patented Nov. 18, 1913.

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JESSE- FAIBBANKS, F MARION; OHIO.

EXCAVATOR.

Application filed August 24, 1911. Serial No. 645,721.

To all whom it may concern:

Be it known that I, Jesse L. FAIRBANKS, a citizen of the United States,residing at Marion, in the county of Marion and State of Ohio, haveinvented a new and useful Excavator, of which the following is aspecification. 7

This invention relates to an improvement in excavators. a

The primary object of this invention is to provide an excavator in whichthe dipper supporting arm travels in a fixed plane durticipating 1n thelongitudinal movement of ing its load-receiving movement.

A further ob ect of the invention is to provlde a simple and eflicientdriving mech- Speeification of Letters Patent.

anism which will. participate inthelongi-= of the handle. ,I+igure 1 isa side eletudinal in-ovemei I In the drawin s vation of the completeapparatus. is a detail view of ta-.1. mechanism.

Fig. 2- dipper arm driving Fig. 3 is a detail view of the-- enginemounting. Fig. at is a side elevation show ng a modified form of drivingmeeh-.

anism. Fig. 5 is a detail of the driving mechanism. i

In the drawings, designates the car or support for the excavator whichsupports the boom' 11 in the usual manner. This boom is supported by abeam 12, shroud 1% connecting said boom and beam. The boom 11 whichsupports the sheave 15 1s of the usual construction being formed ofspaced parallel beams each of which is provided with a racltl'l. Thedipper arm 18 is supported between the parallel beams being also formedof spaced parallel beams which are provided with racks 19. The rackswhich are arranged on the parallel beams'ot themain boom are providedwith portions li" which extend beyond the edges 17 of'the beam. The bedplate 20 of the engine 21 is arranged to slide on the boom, said bedplate being formed with flanges 24 which extend beneath the portions 17of the racks 17. The engine 21 is mounted on a carriage including a bedplate 20., the pitman 21 of said engine, driving the shaft 25 on the endportions of which the gears 1-6 are mounted. The slm't't is supported bythe side plates 27 which are secured to the engine bed and said gearsmesh'with the larger gears 28 ar ranged on a shaft- 29 which is alsosupported by said plate." The shaft 29 is provided with gears 30, 31, 32and'33, the gears 30 and 31 being arranged to engage the racks 17 andthe gears 32 and 33 the racks 19 which are Patented Nov. is. data.

arranged on the handle. "The yoke which is supported by the shaft 29contticts with the edges of the beams which conesper arm downward andconsonant with this r downward pressure the gears 30 and 31 will movethe dipper arm longitudinally through their contact with the rack, theengine parthe dipper arm.

'Steamis supplied to'the reversing valve of the engine by pipes 34, 35,and 36, which are connected by universaljoints 39-which allow the engineto participate in its longitudinal movement; The engine is con trolledby a lever mounted on the car, said lever causing the rotation of a shat4C1 which in turn drives the shaft 12, the,

shafts being connected by a universal conpllng 43. A gear 44 is mountedon the shatt' lQ said shaft passing through said gear, said gear beingadapted to mesh with a gear which actuates the reversmg valve of theengine, the enginein this manner he ing controlled regardless of itsposition on;

the boom.

It will be noted from the foregoing that the arm whichsupportsthe'dipper is maintained perpendicular to the ground in its loadreceiving movement, and although the driving mechanism efiectuallyimpar's longitudinal and vertical movement to the arm,

driving mechanism other than that shown sonant ver-' might besubstituted and the ti al and longitudinal movenn secured.

In the modified form of driving mechanism. the motor is mounted on thecar, and

the shaft 29 is rotated by means of a mechanism similar to the mechanismfor operating the reversing valve of the engine shown .in Fig. 1. Thismechanism consists of the square shaft 34 which imparts i'novenieat to apinion 35' supported by the bracket 36, said pinion 35 meshing with apini 37 arranged on" the end portion of the shs 25. The shaft 34 isdriven by means of at end shaft 38, the shaft being connected byuniversal coupling 39, the shaft 38 beingsupported by a bracket 40.Mounted on said shaft is a disk 41 which bears against the friction gear4-2 which is driven by the mo tor 43. The disk 41' is moved across theface of the friction gear 42' by means of the lever 43", the movement ofthe shaft 84 in this manner being reversed. It will be noted by thisconstruction that the same movement will be imparted to the dipper armas in the construction shown in Fig. '1, the shaft 34: being allowed toparticipate in the movement of the boom by means of the universalcoupling 39, said shaft sliding freely through the pinion 36 as thedipper arm is advanced longitudinally.

' The many advantages of an excavator of this construction will beclearly apparent as it will be noted that a straight line out issecured, with the dipper arm at any angle, the same rotary movementwhich propels. the arm in its load-receiving stroke, consonantlypressing said arm downwardly to prevent the same from traveling in anarc.

Particular attention is called to the fact that an excavator of thischaracter may be easily and economically constructed, the various partsbeing such as may be readily as sembled.

What is claimed is 2- 1. An excavator including a boom, a rack thereon,a dipper arm, a rack uponthe arm, a carriage slidable longitudinallyalong the boom, a gear supported on the carriage and support the arm,sai

novaaaa carriage and meshing with the arm rack to together about acommon axis to simultaneously raise or lower the arm and actuate thecarriage, means engaging the shaft and slidably engaged by the arm forholding the arm rack in mesh driven means movable with the carriage foractuatin the gears.

3. An excavator including a boom, racks thereon, a carriage slidablyengaging the racks, a dipper arm, racks thereon, a shaft journaled onthe carriage, gears upon the shaft and meshing with and constitutingpivots for the arm racks, means extending between the arm racks andtheir gears and engaging the shaft for holding the racks and gears inmesh, gears upon the shaft and meshing with the boom racks, and powerdriven means upon the carriage for actuating all of the gearssimultaneously.

4. An v :cavator including a boom, a rack extending longitudinally ofthe boom, a dipper arm, a rack upon the dipper arm, a carriage slidablymounted on the boom, a shaft journaled on the carriage, means engagingthe shaft and slidably engaged by the arm for holding the arm againstmovement away from the shaft, a gear on the shaft and constantly meshingwith the arm rack, a gear u on the shaft and constantly meshing with theboom rack, and means upon the carriage for actuating the shaft, saiddipper arm beine adapted to swing about the shaft-as an axis.

In testimony that I claim the foregoing as my own, i have hereto affixedmy signature in the presence of two witnesses JESSE L. FAIRBANKS.'Witnessesi J. FiLmTvAnLr, PEARL Sononmanacnn.

with its gean-and power gears being revolu'ble

